Additional file 2 of Prevalence of comorbidity in Chinese patients with COVID-19: systematic review and meta-analysis of risk factors

Additional file 2. Primary data extracted from included studies and sorted based on different comorbidities, computational process of u-test and the result pages of begg’s test and egger’s test in Stata15.附加文件2：从纳入研究中提取的原始数据（已按不同合并症进行分类整理）、u检验（u-test）的计算流程，以及Stata15软件中Begg检验与Egger检验的结果页面。